Fluorescence of harmol, harmalol and 2-hydroxycarbazole in concentrated hydroxide solutions.
Room temperature electronic absorption and fluorescence spectra of harmol, harmalol and 2-hydroxycarbazole have been obtained in concentrated aqueous potassium hydroxide solutions. The appearance of a new fluorescence band for all these compounds in media of H- greater than 16, has been ascribed to the emission of excited dianions formed by deprotonation. Acidity constants have been estimated from the Föster-Weller method.
Hidalgo
J
J
Department of Physical Chemistry, Faculty of Pharmacy, University of Sevilla, Spain.
Carmona
C
C
Balón
M
M
Muñoz
M A
MA
D002227:Carbazoles / Q000032:analysis*; D006246:Harmaline / Q000031:analogs & derivatives* / Q000032:analysis; D006247:Harmine / Q000031:analogs & derivatives* / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides; D011188:Potassium; D017680:Potassium Compounds; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
D002227:Carbazoles; D006878:Hydroxides; D017680:Potassium Compounds; D012996:Solutions; C007904:harmalol; C001326:harmol; D006247:Harmine; C066713:2-hydroxycarbazole; D006246:Harmaline; D011188:Potassium; C029943:potassium hydroxide